Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (0, 0, -1), (0, 1, -1), (1, 0, 0), (1, 1, 0)}.
A149942
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (0, 0, -1), (0, 1, -1), (1, 0, 0), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =49a(5) =172a(6) =627a(7) =2364a(8) =9178a(9) =36322a(10) =146349a(11) =598798a(12) =2479100a(13) =10377197a(14) =43854651a(15) =186810219a(16) =801663799a(17) =3462831008a(18) =15043186516a(19) =65697663852a(20) =288296368358
External references
- oeis: A149942